Been asked by a friend if a single compressor unit can be replaced with a twin?

Would there be any pipe, programming, or wiring changes?

If anyone has done this please let me know, thank you 👍

 

I believe you can, as I was told that the 1-stage was replaced by the 2-stage, with the old one no longer available. But do not know if that is 100% fact.

 

Yes it 100% can since it is basically a standalone system. GM eSI does warn once done to never attempt to update the software on the AS module as it the update systems will think you still have the earlier version (software updates are based on the VIN) and will brick the module by trying to load the single compressor version of the software. That is the only caveat.

 

Thanks everyone.

Pretty much along the lines I thought.


MixManSC re - software update, that makes prefect sense as later ECUs are electronically different e.g.

• Twin version has additional compressor over temperature signal
• The twin version has a separate current monito input for AS Relay + Exhaust whereas the single unit shares the Exhaust with the Inlet Currents

These differences were deduced from the twin electronics schematic and wiring diagrams, there may well be other electronic differences.

Not sure how a Tech2 to would respond when it sees the addition twin data...?

 

As far as diagnostic and whatnot in the Tech2 it should be fine with either version although you might have to select a later model year (specifically for troubleshooting or looking at the AS data) that came with the dual compressor to see the additional data that the dual compressor model offers.

 

Indeed that could be important if the height needs recalibrating ✔️

 

Does anyone have confirmed specification of the air hoses in and out of the air ride compressor assembly? Observing the air hose ports on the compressor assembly there are two I.D. sized hoses. Smaller hose for the airbag and tire inflator lines and a larger ID hose for intake and exhaust.
I see post which shared only one SMC part number (TIUB11C-20 ) which is a 3/8" ID hose, but doesnt indicate if this was used for the airbag line or intake or exhaust. I see other posts which refer to using 6mm and 8mm I.D hoses. Then there is Rebuild Masters who offer lengths of tube which they say is for the airbags and is 1/8" ID. If Rebuild Masters tube is correct, then I expect the intake and exhaust must be 1/4", or maybe 3/8". Can anyone confirm?!??

 

That SMC I listed is for the intake. I think I made that clear in my post.

 

Sorry finall. You're right. Your post was specifically discussing the intake line and my notes lost that context. My apologies, and this pulls it together perfectly. I'll purchase the 3/8" SMC line for revising the intake, and the 1/8" line in case need to replace or extend for the airbags and inflator port.

 

So I think I have everything I need and the truck is soon going into the shop for its frame and suspension "restoration". I was just looking over the dual compressor unit I have to replace my single assembly. Oddly, I am not finding the "exhaust" port anywhere. I have stared at every inch of that whole assembly for an hour and find clearly the two intakes on the compressors themselves, the inflator line port on the distribution connector at output of the compressors, and the airbag ports on the valve block. Just as the below picture shows. But also as the picture shows, the exhaust should be "somewhere near here?", but its not!
Maybe Im misunderstanding... is the exhaust a similar quick release port for another hose, or is it just an outlet?